Groovy: Read and then Write to interactive process - groovy

Question

I am beginning to think my search skills are lacking.
I trying to find any articles on how with Groovy, to open an interactive process, read its output and then write to the process depending on the output text. All I can find is how printing, reading and writing with files. Nothing about how to Write to a interactive process.
The process is asking for a password
Write the password to process
Something like this if possible:
def process = "some-command.sh".execute()
process.in.eachLine { line ->
if (line.contains("enter password")) {
process.out.write("myPassword")
}
}
This here works reading from the process output:
def process = "some-command.sh".execute()
process.in.eachLine { line ->
println line
}
Though it stops when the process is asking for input. It does not print out the line with the question.
Edit: Found out why it did not print the line with the ask password. It was not a new line. The question was a simple print (not println). How do I read when there is not yet a new line?
I have been told expect can be used, but I am looking for a solution which does not require a dependency.

Answer 1

1.bat
#echo off
echo gogogo
set /P V=input me:
echo V=%V%
this script waits for input just after :
gogogo
input me:
this means that eachLine not triggered for input me because no new line after it
however the previous line gogogo could be caught
and following script works for gogogo but does not work for input me
groovy
def process = "1.bat".execute()
process.in.eachLine { line ->
if (line.contains("gogogo")) {
process.out.write("myPassword\n".getBytes("UTF-8"))
process.out.flush()
}
}
groovy2
probably this could be optimized.. following script works without new line:
def process = "1.bat".execute()
def pout = new ByteArrayOutputStream()
def perr = new ByteArrayOutputStream()
process.consumeProcessOutput(pout, perr) //starts listening threads and returns immediately
while(process.isAlive()){
Thread.sleep(1234)
if(pout.toString("UTF-8").endsWith("input me:")){
process.out.write("myPassword\n".getBytes("UTF-8"))
process.out.flush()
}
}